NCT Group NCT 990T - Manual (Page 101)

13 Interruption and Restart of Automatic Operation
101
13 Interruption and Restart of Automatic Operation
In many cases the automatic operation needs to be interrupted, than later on the machining to
be continued. Cases like this for example when:
– the errors must be repaired, than the machining continued when error messages are coming
from program module preprocessor or PLC,
– during machining the program may need to be corrected, for example because of syntactical
error,
– in case of tool break the broken tool must be retracted and replaced, than the machining
continued with the a new tool and - if necessary - new offset values,
– in some phases of machining the result needs to be examined, checked, than the machining
continued,
– if in course of the machining an obstacle, for example workpiece clamping is in the way of
tool path it needs to be rounded, than the machining continued,
– if work has to be paused, for example in case of power breakdown, than continued from the
interruption point.
The above cases require different types of intervention by the operator. The above problems
must be repaired by means of services of the control discussed here.
13.1 Interruption of Automatic Operation
In the course of automatic operation the following interventions cause interrupted state:
– appearance of emergency stop state, e.g. by pressing the EMERGENCY STOP button,
– effect of the RESET key or
– changing the operation mode
The interrupted state is indicated by caption INTD in the 3
rd
field of status bar. In interrupted
state lots of manual interventions can be done on the control, which can be registered or
canceled when restarting.
13.2 Restart of the Automatic Operation. Modal Information.
The automatic operation can be restarted in three ways in INTD state:
– unconditionally,
– by means of the condition BLOCK RESTART or
– by means of the condition BLOCK RETURN .
The difference among the three restart methods is that while in the first case if movement from
interruption point has been made it goes to the block end position, in the second case it goes to
the start position of the interrupted block and re-executes the whole block, and in the third
case it moves back to interruption position and continues machining from there.
In the interrupted (INTD) state of automatic operation the modal information changes by
entering a single block or running the program selected for manual data input mode. Therefore